The Concrete which has low w/c, or Concrete Paving Block (CPB) requires technology in the compaction process. Compaction with vibropressing technology is a compaction technology that combines vibrations and presses that carried out simultaneously. The objection of the research is finding the effect of vibration energy changes on CPB compressive strength characteristics. The research method accordance with the ACI method used the volume proportioning of the mixture are 1 cement: 4 fine aggregate: 4 coarse aggregate with w/c ratio 0.6 and the target compressive strength of the average CPB 18.3 N / mm2. Coarse aggregates take from processing rock breakers with a grain size of 0-5 mm. The samples were tested using a treatment method using a regulator with parameters as a measure to observe the CPB compressive strength characteristics. The settings in question are frequency, vibration time, and pressure during production. This study was conducted repeatedly using a 4 HP electric motor for the first and using a 7HP electric motor. The results showed differences that occurred, starting from recording data on vibration acceleration fluctuations when installing 4HP and 7HP. The higher the vibration energy, the higher the number of vibrations, and the higher the compressive strength produced.

Most of Indonesia area is an earthquake- prone region. This is caused by the confluence of three major plates world that are subduction. Indo-Australian Plate colliding with the Eurasian plate off the coast of Sumatra, Java and Nusa Tenggara, while the Pacific plate in northern Guinea and North Maluku. In the vicinity of the meeting location this plate collision energy accumulated in the form of earthquake. The quake destroyed much of the multi-storey buildings that do not have adequate strength. Therefore , the higher the building, the greater the effects of the earthquake were received by the building. One way to acquire resistance to earthquake response was to add rigidity to a building. How to obtain the stiffness of a building is to install bracing for high-rise buildings. The purpose of this analysis was conducted to determine usage behavior particularly bracing displacement. The Results of this analysis showed a reduction in horizontal deviation of the building due to the addition of frame bracing. The difference in the percentage of horizontal deviation without bresing building and building using bresing X is 82.519%. While the difference in the percentage of horizontal deviation without order bresing building and building using bresing V is 64.904%.Keywords: pushover analysis , bracing, displacement,earthquake AbstrakSebagian besar wilayah Indonesia merupakan wilayah rawan gempa. Hal ini disebabkan oleh pertemuan tiga lempeng utama dunia yang bersifat subdaksi. Lempeng Indo- Australia bertabrakan dengan lempeng Eurasia di lepas pantai Sumatra, Jawa dan Nusa Tenggara, sedangkan lempeng Pasific di utara Irian dan Maluku Utara. Di sekitar lokasi pertemuan lempeng ini akumulasi energi tabrakan terkumpul sehingga lepas berupa gempa bumi. Gempa banyak menghancurkan bangunan- bangunan bertingkat yang tidak mempunyai kekuatan yang memadai. Oleh karena itu, semakin tinggi bangunan maka semakin besar pula efek gempa yang diterima oleh bangunan tersebut. Salah satu cara untuk memperoleh ketahanan terhadap respon gempa adalah menambah kekakuan pada suatu bangunan. Cara memperoleh kekakuan suatu bangunan adalah dengan memasang pengekang (bracing) untuk bangunan tinggi. Tujuan dari analisa ini dilakukan untuk mengetahui perilaku pemakaian bracing khususnya displacement. Hasil dari analisa ini menunjukkan terjadinya pengurangan simpangan horizontal gedung karena adanya penambahan rangka bracing. Selisih presentase simpangan horizontal gedung tanpa bresing dan gedung dengan menggunakan bresing X adalah 82,519%. Sedangkan selisih presentase simpangan horizontal gedung tanpa rangka bresing dan gedung dengan menggunakan bresing V adalah 64,904%.Kata kunci: analisa pushover , bracing, displacement, gempa

To design columns with reinforced concrete material is often used in building construction so that reinforced concrete has several advantages, it is the availability of material, but require a large dimension in holding high capacity. To reduce the dimensions of the column structure can be designed with a composite structure. In this study, an analysis will be carried out to determine the difference in dimensions that can be provided by reinforced concrete columns and composite columns holding an equivalent nominal capacity. This analysis was carried out in a case study of the planning of a 7-story lecture building. The initial design of the column applied is a reinforced concrete column which will then be redesigned with a composite structure using a WF steel profile. Based on the results of the research analysis shows that in holding the nominal capacity equivalent, the dimensions of the composite column used are smaller than the reinforced concrete column. In addition, the volume requirement of the material is also lower, this indicates that the composite column is good enough to be applied in building planning.

No abstract

The compaction method of concrete using a vibrating table uses vibration waves propagation from the base of manufacture and vibration vibrations into the mixed concrete. In this research, variations of frequency use are 40 Hz, 50 Hz, and 60 Hz, with a duration of 8 seconds and 12 seconds. The test objects have cube-shaped with each side measuring 15 centimeters. The mold of concrete is made from plywood boards containing 6 cubes. The concrete was tested using the Compressive Test Concrete tool to determine the compressive strength of the concretes. The research results show that the highest compressive strength is 60 Hz and 12 seconds, which is 32,44 MPa and the lowest compressive strength is 28,74 MPa. ABSTRAK Metode pemadatan beton menggunakan meja getar menggunakan perambatan gelombang getar dari dasar cetakan dan gelombang getaran diserap ke dalam adonan beton. Pada penelitian ini, getaran yang digunakan untuk proses pemadatan memiliki variasi frekuensi 40 Hz, 50 Hz, dan 60 Hz, dan durasi getaran 8 detik dan 12 detik. Benda uji yang digunakan berbentuk kubus dengan tiap sisi berukuran 15 cm. Cetakan beton terbuat dari triplek berisi 6 buah kubus setiap cetakan. plate ini. Beton diuji menggunakan alat Compressive Test Concrete untuk mengetahui kuat tekan beton. Hasil dari penelitian ini adalah kuat tekan tertinggi yaitu 60 Hz dan 12 detik yaitu 32,44 MPa dan kuat tekan terendah yaitu 28,74 MPa.

Designing columns with reinforced concrete material is often used in building construction so that reinforced concrete has several advantages. It is the availability of material, but requires a large dimension in holding high capacity. To reduce the dimensions of the column structure, a composite structure can be designed. In this study, an analysis will be carried out to determine the difference in dimensions that can be provided by reinforced concrete columns and composite columns holding an equivalent nominal capacity. This analysis was carried out in a case study of the planning of a 7-story lecture building. The initial design of the column applied is a reinforced concrete column which will then be redesigned with a composite structure using a WF steel profile. Based on the results of the research analysis, it shows that in holding the nominal capacity equivalent, the dimensions of the composite column used are smaller than the reinforced concrete column. In addition, the volume requirement of the material is also lower. This indicates that the composite column is good enough to be applied in building planning. In terms of price, all sizes of composite of profile WF columns are relatively more expensive than ordinary reinforced concrete columns.