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关于混凝土材料的强度及其性能,许多学者曾进行过多次试验和研究,大多局限于混凝土材料所承受的静压负荷方面;但涉及到混凝土材料在交变负荷作用下的性能及强度变化的试验和研究则很少见到。在设计混凝土及钢筋混凝土结构时,如遇到结构承担交变负荷或震动冲击等负荷作用时,则对混凝土材料多半采用较大的安全系数来保证结构的安全。依靠静压强度来推算其安全系数,可能发生这两方面的问题:一方面是安全系数估计过大,造成材料浪费;另一方面是对安全系数估计不足,造成结构迅速的破坏,它的后果同样是浪费国家资财。因此,研究混凝土材料在交变负荷作用下所具备的性能,对材料的合理使用及保证结构的安全、耐久,
On the strength and performance of concrete materials, many scholars have conducted many tests and studies, mostly confined to the static load of concrete materials, but involves the performance of concrete materials under alternating load and strength changes Experiments and research are seldom seen. In the design of concrete and reinforced concrete structures, such as the case of alternating load or shock load to bear the role of the load, then most of the concrete material with a larger safety factor to ensure the safety of the structure. Relying on the static pressure intensity to calculate the safety factor may occur in two aspects: on the one hand, the safety factor is too large, resulting in material waste; on the other hand, the safety factor is underestimated, resulting in rapid destruction of the structure, its consequences The same is a waste of state assets. Therefore, the study of concrete materials under the action of alternating load with the performance, the rational use of materials and ensure the safety of the structure, durability,