Lightweight concrete technology develops along with construction needs. Styrofoam is an alternative ingredient that can be used in a mixture of concrete to produce lightweight concrete. Experimental research to see the performance of lightweight concrete with the addition of styrofoam. This study uses two types of samples, namely concrete cylinders and beams. The compressive strength and deflection tests were carried out on four types of concrete with various styrofoam mixtures. The results showed that the styro-con performed equivalent to regular concrete based on deflection and strength.
The damage of the bridge structure that occurs in Indonesia is almost close to the number of bridge construction. The damage condition is also related to the influence of Indonesia on active tectonics and volcanic pathways which cause damage to the bridge structures. The analysis of the structural response of the prestressed box girder concrete bridge aims to identify the value of the displacement structure on the bridge pier against the earthquake load. Meanwhile, the structure responses numerical analysis of the prestressed box girder concrete bridge using MIDAS CIVIL software. The analysis of structure response prestressed box girder concrete-bridge structure is carried out with three soil conditions, that is hard soil, medium soil, and soft soil. The results of the study, the displacement value on the pier bridge on X direction for hard soil conditions is 1.26 cm, medium soil is 1.53 cm, and soft soil is 2.02 cm. Thus, it can be concluded that the value of the bridge displacement due to the planned earthquake load on hard soil conditions is 21.4% smaller than that in the medium-soil condition and 60.32% smaller than the soft soil.
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