arch springing hinge 拱脚铰
And because of its low design carrying capacity, some damages are appearing now, such as arch leaking, mortar weathering and arch springing cracking.
这些早期建造的石拱桥由于设计承载力较低、环境腐蚀等原因，逐渐出现一些损伤，如拱圈漏水、砂浆风化、拱脚开裂等。
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